| DISHARMONIOUSLY | • disharmoniously adv. In a disharmonious manner. • DISHARMONIOUS adv. lacking in harmony. | 
| HALFSERIOUSLY | • HALFSERIOUSLY adv. in a partially joking way. | 
| HYALURONIDASES | • hyaluronidases n. Plural of hyaluronidase. • HYALURONIDASE n. a mucolytic enzyme that facilitates the spread of fluids through tissues by lowering the viscosity of hyaluronic acid. | 
| HYDROACOUSTICS | • hydroacoustics n. Any of various sciences and technologies dealing with sound transmitted through water. • HYDROACOUSTICS n. the study of sound travelling through water. | 
| HYPERACUSIS | • hyperacusis n. (Medicine) A heightened sensitivity to some sounds, especially extremely loud noises. • HYPERACUSIS n. an abnormally good sense of hearing. | 
| HYPERFASTIDIOUS | • hyperfastidious adj. Extremely fastidious. • HYPERFASTIDIOUS adj. excessively fastidious. | 
| HYPERSTIMULATES | • hyperstimulates v. Third-person singular simple present indicative form of hyperstimulate. • HYPERSTIMULATE v. to stimulate excessively. | 
| HYPERURBANISMS | • hyperurbanisms n. Plural of hyperurbanism. • HYPERURBANISM n. use of hypercorrect forms in language. | 
| ICHTHYOSAURIANS | • ichthyosaurians n. Plural of ichthyosaurian. • ICHTHYOSAURIAN n. a large fossil marine reptile, also ICHTHYOSAUR, ICHTHYOSAURUS. | 
| ICHTHYOSAURS | • ichthyosaurs n. Plural of ichthyosaur. • ICHTHYOSAUR n. a large fossil marine reptile, also ICHTHYOSAURIAN, ICHTHYOSAURUS. | 
| ICHTHYOSAURUS | • ichthyosaurus n. (Archaic) Alternative form of ichthyosaur. • ichthyosaurus n. Any members of the genus Ichthyosaurus. • Ichthyosaurus prop.n. A taxonomic genus within the family Ichthyosauridae – large, extinct marine reptiles. | 
| ICHTHYOSAURUSES | • ICHTHYOSAURUS n. a large fossil marine reptile, also ICHTHYOSAUR, ICHTHYOSAURIAN. | 
| PLEURAPOPHYSIS | • pleurapophysis n. A process on a vertebra that is essentially a vertebral rib. • PLEURAPOPHYSIS n. a lateral process of a vertebra, with the morphological character of a rib. | 
| PSYCHOSURGICAL | • psychosurgical adj. Relating to psychosurgery. • PSYCHOSURGICAL adj. relating to psychosurgery. | 
| SQUARISHLY | • squarishly adv. In a squarish way. • SQUARISH adv. somewhat square. | 
| SUPERHIGHWAYS | • superhighways n. Plural of superhighway. • SUPERHIGHWAY n. a multilane highway (as an expressway or turnpike) designed for high-speed traffic. | 
| SUPERPHYSICAL | • superphysical adj. Above or beyond physics; not explainable by physical laws. • SUPERPHYSICAL adj. being above or beyond the physical world or explanation on physical principles. |